Thalia (/θəˈlaɪə/; Ancient Greek: Θάλεια, Θαλία; "the joyous, the flourishing", from Ancient Greek: θάλλειν, thállein; "to flourish, to be verdant") was the Muse who presided over comedy and idyllic poetry. In this context her name means "flourishing", because the praises in her songs flourish through time.[1] She was the daughter of Zeus and Mnemosyne, the eighth-born of the nine Muses.

She was portrayed as a young woman with a joyous air, crowned with ivy, wearing boots and holding a comic mask in her hand. Many of her statues also hold a bugle and a trumpet (both used to support the actors' voices in ancient comedy), or occasionally a shepherd’s staff or a wreath of ivy.